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Diodes Incorporated MMBZ5248BQ-7-F
- Part No.:
- MMBZ5248BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5248BQ-7-F.pdf
- Description:
- DIODE ZENER 18V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
MMBZ5248BQ-7-F from Diodes Incorporated is a 18 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 7.0 mA test current with 21 Ω dynamic impedance at 1 kHz and 0.1 µA reverse leakage at 14 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the MMBZ5248BQ-7-F datasheet, MMBZ5248BQ-7-F pinout, MMBZ5248BQ-7-F application, or MMBZ5248BQ-7-F equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (357 °C/W), JEDEC-compliant reliability, and SOT23 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar die construction ensures consistent Zener characteristics and low parameter drift over time.
Designed for operation at 25°C ambient with derating above 25°C per Fig. 1, it delivers regulated output with 17.1–18.9 V nominal range, 21 Ω impedance at IZT = 7.0 mA, and <0.1 µA leakage at VR = 14 V - enabling use in battery-powered sensor references and I/O clamp networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 17.1–18.9 V range at IZT = 7.0 mA - defines regulation setpoint for reference or clamping |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - limits continuous current to ~19.4 mA at 18 V without heatsinking |
| Zener Impedance (ZZT) | 21 Ω at f = 1 kHz, IZT = 7.0 mA - determines regulation stiffness under dynamic load changes |
| Reverse Leakage (IR) | 0.1 µA max at VR = 14 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Thermal Resistance (RθJA) | 357 °C/W - requires board-level thermal management for sustained >100 mW operation |
| Package | SOT23 - 3-pin surface-mount outline compatible with standard pick-and-place and reflow processes |
Pinout & Package
Package: SOT23 - molded plastic, green compound (UL 94V-0), matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground node | Connected to system ground or lower-potential rail when used as shunt regulator |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 18 V reference relative to anode; connects to input supply via series resistor |
| No Connect (Pin 3) | Internal die attach pad / thermal slug | Not electrically connected; serves mechanical anchoring and minor thermal conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ distribution and long-term stability under thermal cycling |
| 350 mW dissipation on FR-4 | Enables direct integration into space-constrained consumer and industrial PCBs without auxiliary cooling |
| JEDEC-compliant high-reliability qualification | Validated for automotive-grade change control readiness and AEC-Q200-aligned stress testing |
| Lead-free, halogen- and antimony-free | Meets RoHS 3 (2015/863/EU) and "Green" definitions (<900 ppm Br/Cl, <1000 ppm Sb) |
Applications
| Low-Power Sensor Reference | Microcontroller I/O Clamp |
|---|---|
|
Use Scenario: Providing stable 18 V bias for analog front-end op-amps in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining fixed headroom for signal conditioning circuitry. Use Value: Enables accurate 12-bit ADC readings by reducing supply-induced offset drift below ±0.5% over -40°C to +85°C. |
Use Scenario: Protecting 3.3 V GPIO pins from transient overvoltage during hot-plug events in industrial controllers. IC Role / Device Role / Timing Role: Bidirectional ESD clamp limiting voltage excursion to ≤18 V during fast transients. Use Value: Prevents latch-up and oxide damage with <0.1 µA leakage ensuring no measurable impact on input leakage specs. |
| USB-C Power Negotiation Monitor | Automotive Body Control Module |
|
Use Scenario: Regulating auxiliary 18 V rail for USB PD communication ICs in portable power banks. IC Role / Device Role / Timing Role: Precision Zener reference for voltage feedback loop in buck-boost controller. Use Value: Maintains ±5% regulation accuracy across 10–100 mA load steps, supporting USB PD 3.0 compliance. |
Use Scenario: Supplying regulated 18 V to LIN transceiver bias networks in door module ECUs. IC Role / Device Role / Timing Role: Overvoltage suppression element protecting LIN PHY against load-dump spikes. Use Value: Withstands 12 V nominal bus surges up to 27 V per ISO 7637-2 Pulse 5a, meeting AEC-Q200 Class 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18 V nominal, but 250 mW PD, 40 Ω ZZT, and SOT23-3L package with full 3-pin connectivity | Limited to lower-power clamping; not suitable for >14 mA continuous regulation | Select when lower cost and legacy footprint compatibility outweigh power margin needs |
| MMSZ5248ET1G | Same 18 V rating, 500 mW PD, 15 Ω ZZT, but SOD-123 package - larger footprint and higher thermal mass | Better thermal performance but incompatible with fine-pitch SOT23 layouts | Choose for higher-reliability industrial designs where board area permits and 350 mW is insufficient |
Compared with BZX84-C18LT1G and MMSZ5248ET1G, MMBZ5248BQ-7-F uniquely balances SOT23 compactness, 350 mW capability, and 21 Ω impedance - making it optimal for space-constrained, medium-current regulation where thermal budget and layout density are critical.
Availability
MMBZ5248BQ-7-F is available at Aetrix Electronics and suitable for low-power sensor reference, microcontroller I/O clamp, and automotive body control module applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMBZ5248BQ-7-F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
This device belongs to the MMBZ52xxB series of 350 mW Zener diodes engineered for precision voltage regulation and transient suppression in automotive, industrial, and consumer electronics with strict environmental compliance requirements.
FAQ
What is the maximum continuous Zener current for MMBZ5248BQ-7-F at 25°C ambient?
The maximum continuous Zener current is calculated from PD = 350 mW and VZ = 18 V, yielding ~19.4 mA. Derating begins above 25°C per Fig. 1, reaching zero dissipation at ~150°C ambient due to RθJA = 357 °C/W.
Is MMBZ5248BQ-7-F qualified for automotive applications?
MMBZ5248BQ-7-F is not AEC-Q200 qualified, but it is manufactured in IATF 16949-certified facilities and meets JEDEC high-reliability standards. For automotive use, Diodes offers Q-suffix variants like MMBZ5248BQ-7-FQ with full PPAP documentation and AEC-Q200 stress testing.
How does the "Q" in MMBZ5248BQ-7-F differ from MMBZ5248B-7-F?
The "Q" suffix indicates qualification to automotive change control requirements - including AEC-Q200 alignment, PPAP capability, and traceability to IATF 16949 manufacturing sites. Electrically and physically, both share identical Zener voltage, impedance, and SOT23 package dimensions.
Can MMBZ5248BQ-7-F be used in place of a 1N4746A?
No - the 1N4746A is a 18 V, 1 W through-hole Zener in DO-41 package. MMBZ5248BQ-7-F has only 350 mW dissipation and SOT23 footprint. Substitution requires verifying thermal design, PCB layout, and current demand; it is not a drop-in replacement.
MMBZ5248BQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5248BQ-7-F FAQ
1.How can I place an order for MMBZ5248BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248BQ-7-F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MMBZ5248BQ-7-F reliable?
The price and inventory of MMBZ5248BQ-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5248BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5248BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248BQ-7-F?
MMBZ5248BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248BQ-7-F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MMBZ5248BQ-7-F?
For technical support, including MMBZ5248BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248BQ-7-F requirements.
6.How does Aetrix verify that MMBZ5248BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5248BQ-7-F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBZ5248BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5248BQ-7-F?
All MMBZ5248BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248BQ-7-F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MMBZ5248BQ-7-F part is unused and in its original packaging.
Return procedure for MMBZ5248BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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